RECENT TOPICS OF REAL PHOTON PHYSICS WITH TAGX AT TOKYO AND PERSPECTIVES WITH SPRING-8 - THE PURSUIT OF THE PROTON-NEUTRON SYSTEM

摘要

The proton-neutron (j>n) system has been investigated with the real photon in the A-resonance region. The pn pairs in 3He is found to be three-times more active in absorbing the photon. The photon absorption cross section by theprc pairs in 4He show a jump at the pion production threshold. A future extension of the study in the tagged-polarized-GeV photon beam line at the laser-backward-Compton scattering facility of the SPring-8 ring is mentioned.